Analysis of changes in ink viscosity on printing what impact?
The viscosity of the ink is about the transfer of ink performance, printing ink layer fastness, permeability and gloss of the important conditions, so the ink viscosity is too large or too small, will adversely affect the quality of printing. If the ink viscosity is too large, easy to cause the sheet dirt, ink, ink, paper cloth pulling hair paper powder, thismakes paste or hair; if the ink viscosity is too small, then prone to slip by glue print staves, and ink, Bumo a pale hair, bad imprinted ink emulsion floating, dirty and other undesirable phenomena.
Ink viscosity depends mainly on the composition of the ink composition, characteristics and proportion, but also with the temperature, printing machine speed and so on. When the temperature is low ink viscosity is high; low speed printing machine ink viscosity is high; the number of root roller printing machine use less ink viscosity is high. This is because the ink has thixotropy, when the heat is large, the ink becomes thin, and its viscosity will be reduced. Because many machine speed and rollers, determines the machine movement process of friction heat the size of printing machine in the case of large friction coefficient, the ink in the external movement and the heating effect, so it is easy to dilute, its viscosity is decreased. The viscosity of the ink is adjustable, according to the printing conditions to add appropriate ink additives, such as No. 0, No. 6 inking oil, such as adhesive, can increase or reduce the viscosity of the ink, in order to facilitate the realization of normal printing.
The printing paper surface is smoother, the paper surface intensity is better, the ink viscosity may be suitable. Conversely, the surface strength of the paper, the ink viscosity should be smaller, in order to obtain relatively good printing effect.
